Daily maintenance of asphalt mixing plant equipment

17 Jan 2020 09:00
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Asphalt mixture mixing equipment (asphalt concrete mixing equipment) works in open space, dust pollution is very large, many parts work at 140-160 degrees high temperature, and the working time of each shift is 12-14h, therefore, the equipment Daily maintenance is related to the normal operation and service life of the equipment. How to do the daily maintenance and maintenance of the asphalt mixing plant equipment?
Work before asphalt starter
Before starting the machine, the materials scattered near the conveyor belt should be removed; firstly, the load is started, and the load can be operated after the motor is running normally. When the equipment is under load operation, special personnel should be set to track the equipment, adjust the tape in time, and observe the running status of the equipment. See if there are any abnormal sounds and abnormal phenomena, and whether the exposed meter display is working properly.

If an abnormality is found, the cause should be identified and eliminated.

After each shift, the equipment should be inspected and maintained in a comprehensive manner; for high-temperature moving parts, grease should be added after each shift; air filter and air-water separator filter for air compressor; air compressor oil Oil level and oil quality; check the oil level and oil quality in the reducer; adjust the tightness of the tape and chain, replace the tape and chain when necessary; clean the dust in the dust collector and the debris scattered in the field , waste, keep the site clean and tidy.

The problem of patrolling the mountain from work should be thoroughly eliminated after the shift and the operation record should be made.

In order to grasp the full use of the equipment.

Maintenance work must have a persistent idea, not a one-night work, must be timely and appropriate maintenance, in order to extend the life of the equipment and maintain its production capacity.

Three-dimension and three-check work of asphalt mixing plant
asphalt mixing plant is an electromechanical integrated equipment, which is more complicated and has a harsh working environment. To ensure that equipment is less faulty, the crew must do “three diligences”: diligent inspection, diligent maintenance, and diligent maintenance.

“Three inspections”: equipment inspection before start-up, inspection during operation, inspection after shutdown.

Do a good job in equipment maintenance and regular maintenance work, do a "cross" operation (cleaning, lubrication, adjustment, fastening, anti-corrosion), manage well, use well, maintain good equipment, ensure the integrity rate and utilization rate, for maintenance The parts should be maintained in strict accordance with the equipment maintenance requirements.

Do routine maintenance work and carry out maintenance in strict accordance with equipment maintenance requirements.

During the production period, it is necessary to watch, listen to the ear, and immediately stop the maintenance due to abnormal conditions.

Maintenance and commissioning work is strictly prohibited when the equipment is in operation.

Special personnel should be monitored for key parts.

Reserve the consumable parts and study the cause of the damage.

Carefully fill in the operation and operation records, mainly record what is happening, what is happening, how to analyze the exclusion and how to prevent it, and the operation record as a first-hand information has a good reference value.

The troubleshooting during production should be calm and calm, and should not be violent. As long as you master the rules and patiently think, any faults can be solved well.

Daily routine maintenance of asphalt mixing plant
1.
Lubricate the equipment according to the lubrication schedule.

2.
The vibrating screen is inspected according to the maintenance instructions.

3.
Check for leaks in the air line.

4.
Blockage of large particle size overflow pipes.

5.
Control room dust, excessive dust will affect electrical equipment.

6.
After the equipment is deactivated, the discharge door of the mixing tank is cleaned.

7.
Check and tighten all bolts and nuts.

8.
Check the screw conveyor shaft seal lubrication and necessary calibration.

9.
Check the lubrication of the stirring drive gear through the observation hole and add the lubricating oil as appropriate.

Checked every week (every 50-60 hours)
1.
Lubricate the equipment according to the lubrication schedule.

2.
Inspect all conveyor belts for wear and damage and repair and replace if necessary.

3.
When the blade is agitating the cylinder drive device, check the oil level of the gearbox and, if necessary, inject the corresponding lubricant.

4.
Check the tension of all V-belt drives and adjust if necessary.

5.
Check the tightening of the hot lift bucket bolts, and move the adjustment grid to facilitate the entry of hot aggregate into the screen box.

6.
Check the chain and head, tail shaft sprocket or drive wheel of the hot hoist and replace if necessary.

7.
Check the draft fan for dust clogging - excessive dust can cause severe vibration and abnormal bearing wear.

8.
Check all gearboxes and add the recommended lubricants as needed when needed.

9.
Check the connection points and accessories of the tension sensor.

10.
Check the tightness and wear of the screen and replace if necessary.

11.
Check the gap of the feed hopper break switch (if installed).

12.
Check the wire and wear of all wire ropes and check the top limit switch and proximity switch.

13.
Check the cleaning of the stone powder weighing hopper outlet.

14.
The lubrication of the mining trolley drive bearing (if installed), the winch gear and the bearing of the mine door.

15.
The return of the primary dust collector check valve.

16.
The inner surface of the drying cylinder is worn by the scraping plate, the drying cylinder drives the chain splicing, the pin, the lotus wheel (chain drive), the adjustment of the drive wheel coupling of the drying cylinder, the support wheel and the thrust wheel and the friction (friction drive).

17.
Wear of the mixing cylinder blades, mixing arms and shaft seals, and adjust or replace if necessary.

18.
Blockage of asphalt spray pipe (sealing of self-flow inspection door)
19.
Check the oil level in the lubrication system of the pneumatic system and fill it up if necessary.

Monthly inspection and maintenance (every 200-250 operating hours)
1.
Lubricate the equipment according to the lubrication schedule.

2.
Check the chain and hopper and sprocket fastening and wear of the hot hoist.

3.
Replace the sealing packing of the powder screw conveyor.

4.
Clean the impeller of the induced draft fan to check for rust and check the tightening of the anchor bolts.

5.
Detect the wear of the thermometer (if installed)
6.
Wear of the hot aggregate bin level indicator device.

7.
Use high-precision temperature indicators to monitor the accuracy of the field's thermometers and thermocouples.

8.
Inspect the drying cylinder scraper and replace the heavily worn scraper.

9.
Check the burner according to the burner's operating instructions.

10.
Check the leakage of the asphalt three-way valve.

Check and maintain every three months (every 600-750 operating hours).

1.
Lubricate the equipment according to the lubrication schedule.

2.
Check the inside of the hot hopper and the wear of the discharge door.

3.
Check the damage of the screen support spring and the bearing housing and adjust it according to the geotextile manual if necessary.

Check and maintain every six months
1.
Lubricate the equipment according to the lubrication schedule.

2.
Replace the mixing cylinder blades and bearing grease.

3.
The whole motor is lubricated and maintained.

Annual inspection and maintenance
1.
Lubricate the equipment according to the lubrication schedule.

2.
Clean the gearbox and gear shaft assembly and fill with the appropriate lubricant.

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